Experimental study of swimming droplets: Physico-chemical and hydrodynamic mechanisms

Abstract : The goal of this thesis work is to propose a propulsion mechanism that accounts for the swimming properties of water droplets with a diameter of tens of micrometers in a mixture of squalane and monoolein. As a matter of fact, with the right composition, these water droplets are able to swim along a distance much longer than their diameter, and for about two hours. Two main variants of this system have been studied in this work: one that hosts the Belouzov-Zhabotinsky reaction, another that is chemically passive. After stating the main notions and equations involved in the description of the motion of these droplets, the microfluidic experimental setup that satisfies very constraining specifications to produce these droplets will be presented. Then, for each of the two variants, the behavior of the swimming droplets will be described and confronted to a hydrodynamic model to account for their self-propulsion. The comparison of these two cases, and of their respective variants, will highlight the existence of two different mechanisms, both taking their roots in an inhomogeneity of surface energy, that is to say in the Marangoni effect.
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https://pastel.archives-ouvertes.fr/tel-01118927
Contributor : Ziane Izri <>
Submitted on : Friday, February 20, 2015 - 1:25:35 PM
Last modification on : Tuesday, August 27, 2019 - 1:16:38 AM

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Ziane Izri. Experimental study of swimming droplets: Physico-chemical and hydrodynamic mechanisms. Soft Condensed Matter [cond-mat.soft]. Université Paris Diderot - Paris 7, 2014. English. ⟨tel-01118927⟩

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